Tightening device for type



TIGHTENING DEVICE FOR TYPE Filed Dec. 2, 1932 wm for.' TEM @5f/am @n @SL Patented Aug. 14, 1934 M TIGHTENING DEVICE' FOR lTYPE Robert Strahm, Bern, Switzerland Application December 2, 1932, Serial No., 645,391` In Switzerland July 16, 1932 n s. claims. (o1. iol-404) My invention relates to tightening devices for type- Forvholding type together the same has heretofore been simply tied with cords. As the defects attaching to this mode of tying are serious, because the cords become loose and-have to be removed for printing in a machine, it has been proposedto use for this purpose frames or furniture which, however, on account of rigidity are used only for certain sizes of type and, therefore, have only a restricted use. It has also been proposed to use bands instead of cords, and to connect their ends together by means of pins. p

These well-known tightening devices do not permit of the type being embraced suiciently tightly for not only holding the type together but also preventing so-called picks, i. e. rising ofthe space-lines and like blind `material in the machine during theprinting operation; i*

According to the present invention, there is provided a type-tightening or tensioning device, comprising a band for encircling the type, which device is characterized by a winding mandrel or spindle for the band which mandrel or spindle can be held against rotation by a ratchet wheel and is held in two discs rotatably inserted from outsideointo the webs or 'limbs ofa bar or rail serving as a column strip of furniture,` of lwhich discs oneisformed on the outside with .ratchet teeth, adapted to be automatically engagedv by a toothed detent which is elastically displaceable on said bar or rail, the arrangement beingsuch that the space between the limbs of the bar or rail is left quite free for the passage of the metal band.

According to the present invention, the mandrel is formed by two adjacent wires which extend beyond the toothed disc and are rigidly connected together by a middle piece so that they can be used as a pin for receiving a key for tur'ning the mandrel, and the discs are held in their bearings by the middle piece.

Preferably, the winding mandrel is arranged at one end of the rail or bar, at which end the rear wall of the latter is removed.

One embodiment of the invention is diagrammatically illustrated by way of example in the accompanying drawing, wherein:

Figure 1 is a vertical sectional elevation showing one form of type tightening device embodying the invention.

Figure 2 is a horizontal section thereof, partly broken away,

Figure 3 is a detail plan view, and

Figureii is a section taken on the line IV-IV in Fig. 3.

Like reference characters designate like parts in all the views.

As shown ron the drawing, a frame in the form of. a rail or bar l of U-section, which can be used as column furniturehas its rear wall removed at one end leaving the side webs free. A winding mandrel 2 for winding up and tightening a metal band 3 to encircle the type is' rotatably mounted in the webs at that end of the rail. This mandrel comprises two parallel heavy wires of round'section, so that sharp edges which might crease or crack the band are avoided. At their lower ends the wires are rigidly connected-together by afdisc 8 having a rabbeted or. grooved periphery.' This disc 8 is rotatably inserted from below, i. e. outside, into a circular recess 9 in the lower web of the U -shaped frame. 1. 'I'he upper ends of the wires forming the mandrel 2 extend through a disc 10 which has its periphery rabbeted and has its reduced por-` tionrotatably `inserted from above, i. e. outside, into the -upper web of the Ll-shaped frame 1. The upper ends of the wires forming the man-- drel2 extend upwards .beyond the disc 10 and by a distance piece or spacer l2v being welded to them, are .given the shape of a flattened pin,

over which. a hollowY key can be placed for turn ing the mandrel 2.`

. The Wires 2 are thus securely and rigidly connected together bythe spacer 12 and the discs 8 and l0V sothatthey cannot be twisted even when a severe torque is applied to the mandrel. Further, the distance between the discs 8 and is determined very simply by the distance piece 12, so that the discs are reliably held in their seats in the webs of frame, 1.

A slot 5 for the insertion of the end of the band to be wound up on the mandrel 2 is constituted by a space between the two wires. The other end of the band is preferably led round the rear or bottom wall of the frame 1 and inserted into a vertical slit l in the rear wall.

The portion of the disc 10 of larger diameter is provided with ratchet teeth 11, with which engages a relatively broad bolt or detent 13 having corresponding ratchet teeth at its free front end. The other or rear end is bent upwards (Fig. 1) and is guided to move on the upper limb or web of frame 1 by a forwardly extending pin 14 which enters into a hole in the upwardly bent end of detent 13. The latter having the form of a blade is also guided by a pin 15 carried by the upper web of frame 1 and ex- One advantage of the above describedimproved type-tightening device as compared with the old 4 devices is that between the webs of the U-shaped frame of the device there are no parts-which obstruct the band or binder while being wound on the mandrel. Therefore, a considerably'thinner and broader band can be used than in the known tensioning devices, which results in an improved binding action, and yet the device can be made very small. Because of the employment of a broad metal band its thickness may be equal to the usual unit of change of size of a type, i. e. half a point, that is 0.18 mm., so that when the herein described band-tensioningdevice is used the sizes of the composed type may be kept Within the usual limits, which is not the case with narrow bands and those of textile fabric when several sets of type are to be put in the press and a predetermined size for all the sets must be maintained.

Another advantage is that as the mandrel 2 is situated at the end of the frame 1 of U-section and the rear wall thereof is removed at that end, the mandrel is easily accessible for the insertion of the metal band, and it is possi--V ble to employ a narrow frame of a thickness equal to a standard column stick and yet windv up a predetermined `or sufficient length of band to enable making any corrections in the type, e. g.

v removal of an entire line, which necessitates shortening the band.

Again, when the band is Wound. on the mandrel, it is not bent around any sharp edges which under some circumstances might cause cracks in the band. Also, the improved device is simple and, therefore, can be made at a low cost.

Since, as mentioned above, thei metal band, because of its thinness, projects very slightly laterally from the type, and as the -band is broad a large number of sets of type each provided with the herein described tensioning device; can be' secured ina printing press, the frame 1 being suitable for use as part of a column strip. On the other hand, the device enables thek matter to be readily loosened in the press for the purpose of making corrections, since the locking device of the mandrel is readily accessible.

I claim:

1. A band tensioning device of the type described comprising in combination a frame of U-section adapted to serve as furniture for type, two discs journaled one in the outer'face of each web of the frame, one of which discs has a toothed periphery, a mandrel carried by said discs, a. spring-controlled detent movable on said frame and engaging the toothed disc, the space between saidwebs being unoccupied except by said mandrel and being left free for the band.

2. A band-tensioning device of the type described comprising in combination a frame or bar of U-section adapted to serve as a column strip of furniture for type, two discs journaled one in the outer face of each web of the frame, one of which discs has a toothed periphery, a mandrel comprising two parallel wires securely carried by said discs and extending beyond the outer face of one of them, and a distance piece rigidly connected tol said wires at their outer end, which end serves for receiving a key for rotating the mandrel, and a spring-controlled detent slidable on said frame and engaging the toothed disc.

3. A band-tensioning device of the character described according to claim 1, characterized in that the mandrel is of substantially oval crosssection and has a longitudinal slot for receiving one endof the band.

4. A band-tensioning device according to claim 1, wherein the mandrel comprises two wires, each of circular cross-section, spaced apart between their ends to form a slot for receiving one end of the band.

5. VA band-tensioning device according to claim 1, wherein the detent has the form of a blade having a plurality of' teeth at one end for engaging the teeth of the' disc.

6. A band tensioning device of the kind described, comprising a substantially U-shaped frame adapted to serve as furniture for type, two disks rotatably journalled one each in the parallel webs of said frame, a slotted mandrel operatively associated with said disks so asto rotate therewith, a portion of the rear Wall of said frame between said Webs being removed permitting an open space to be formed capable of receiving the roll of band while being wound on said mandrel.

- ROBERT STRAHM.

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